采煤机截齿截割煤体时，截齿承受随时间而变化的动载荷。
The cutter of the coal mining machine bears dynamic load varying with time during excavating coal.
介绍了综采割煤二次负压降尘装置结构、工作原理以及在朔里煤矿综采工作面使用情况。
Author introduces the structure and the working principle of the secondary dust removal device with negative pressure as well as the application to fully mechanized mining face in Shuoli colliery.
同时，严格执行每日割煤10刀、放煤5刀、推进6米的生产循环，工作面实现稳步推进。
Meanwhile, the strict implementation of the 10-day coal-cutting knife, caving 5 knives, 6 meters to promote the production cycle, face to achieve steady progress.
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